mount multiple cloud services combined

Hi There,

As we all know, there's multiple cloud storage services out there (box.com,
wuala.com, google drive, dropbox and probably more) and they all offer 1 - 5
GB of space free of charge. Now I think it would be sweet if ytou were able
to combine the different spaces into one mount point and let either another
app or the os take care of where to store the data. Is there anything like
that available already or does Linux even by itself contain such
functionality? Ideas, input and suiggestions are appreciated!

Thanks,
Ron
.